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NCERT Exemplar Solutions Class 9 Science Solutions for Is Matter Around Us Pure ? - Exercise in Chapter 2 - Is Matter Around Us Pure ?

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Question 36 Is Matter Around Us Pure ? - Exercise
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A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in Fig.2.3. The filter paper was removed when the water moved near the top of the filter paper.

(i) What would you expect to see, if the ink contains three different colored components?

(ii) Name the technique used by the child.

(iii) Suggest one more application of this technique.

Answer:

(i) If the ink contains three different colored components then you can observe three different bands on the paper

(ii) The child uses the technique of paper chromatography

(iii) Paper chromatography is used to separate different pigments present in the chlorophyll.

Video transcript
"are going to solve a question that is an experiment so the question is a child wanted to separate the mixture of constituent sample of ink he marked a line by a ink on the filter paper and placed the filter paper in the glass containing the water a filter paper were moved when the water moved near the top of the filter paper what would you expect to see if the ink contains three different colored components second name the technique used by child and the last one suggest one more application of this technique so the so a child is there who is doing an experiment he has that made a experimental sector so he wants to separate the mixture of dyes with constituting a sample of ink line so first of all he take a beaker filled with a water then he he take a filter paper draw a line on it and places the ink droplet and let it to dry for some time then he places this filter paper inside this one like this way this is the filter paper or the ink now here the ink and the water is just exact very very close so later after some time the boy removed the paper from the filter from the water so what would you expect when he will remove the paper so exactly what happens is when he keep this paper inside it the paper becomes wet and the water level get rises due to the capillary action and also the different colors are shown here like as the water rises different bands of color red then blue green so different bands of color are shown so when the boy did it as for the color that is present in the ink so this method is called you "
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